/*
 * Copyright (c) 2015, EURECOM (www.eurecom.fr)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are
 * those of the authors and should not be interpreted as representing official
 * policies, either expressed or implied, of the FreeBSD Project.
 */

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define G_LOG_DOMAIN ("BUFFERS")

#include <glib.h>

#include "buffers.h"
#include "rc.h"

extern int debug_buffers;

static int buffer_fetch(buffer_t *buffer, uint32_t offset, int size,
                        void *value);

/* Try to fetch 8 bits unsigned from the buffer */
uint8_t buffer_get_uint8_t(buffer_t *buffer, uint32_t offset) {
  uint8_t value;

  buffer_fetch(buffer, offset, 1, &value);
  return value;
}

/* Try to fetch 16 bits unsigned from the buffer */
uint16_t buffer_get_uint16_t(buffer_t *buffer, uint32_t offset) {
  uint16_t value;

  buffer_fetch(buffer, offset, 2, &value);
  return value;
}

/* Try to fetch 32 bits unsigned from the buffer */
uint32_t buffer_get_uint32_t(buffer_t *buffer, uint32_t offset) {
  uint32_t value;

  buffer_fetch(buffer, offset, 4, &value);
  return value;
}

/* Try to fetch 64 bits unsigned from the buffer */
uint64_t buffer_get_uint64_t(buffer_t *buffer, uint32_t offset) {
  uint64_t value;

  buffer_fetch(buffer, offset, 8, &value);
  return value;
}

static int buffer_fetch(buffer_t *buffer, uint32_t offset, int size,
                        void *value) {
  if (buffer == NULL || value == NULL) return -1;

  if (size <= 0) return -1;

  if (buffer->size_bytes < ((offset >> 3) + size)) {
    g_warning("Not enough data to fetch");
    return -1;
  }

  memcpy(value, &buffer->data[offset >> 3], size);
  buffer->buffer_current = &buffer->data[(offset >> 3) + size];
  return 0;
}

int buffer_fetch_nbytes(buffer_t *buffer, uint32_t offset, int n_bytes,
                        uint8_t *value) {
  if (buffer->size_bytes < ((offset >> 3) + n_bytes)) {
    g_warning("Not enough data to fetch");
    return -1;
  }

  memcpy(&value[0], &buffer->data[offset >> 3], n_bytes);
  return 0;
}

int buffer_fetch_bits(buffer_t *buffer, uint32_t offset, int nbits,
                      uint32_t *value) {
  uint32_t temp = 0;
  int i;

  if (buffer == NULL || value == NULL) return RC_BAD_PARAM;

  /*
   * We cannot fetch more than 32 bits
   */
  if (nbits > 32) return RC_BAD_PARAM;

  for (i = 0; i < nbits; i++) {
    temp |= ((buffer->data[(offset + i) / 8] >> ((offset + i) % 8)) & 1) << i;
  }

  *value = temp;
  return RC_OK;
}

/**
   @brief Create a new buffer from data
   @param buffer caller reference where created buffer will be stored
   @param data Data to attach to the new buffer
   @param length Length of data buffer
   @param data_static flag that indicates if data pointer has been statically (=
   0) or not (!= 0)
*/
int buffer_new_from_data(buffer_t **buffer, uint8_t *data,
                         const uint32_t length, int data_static) {
  buffer_t *new;

  if (!buffer) return RC_BAD_PARAM;

  new = malloc(sizeof(buffer_t));
  new->size_bytes = length;

  if (data && length > 0) {
    if (data_static == 0) {
      new->data = malloc(sizeof(uint8_t) * new->size_bytes);
      memcpy(new->data, data, new->size_bytes);
    } else {
      new->data = data;
    }

    new->buffer_current = &new->data[0];
  } else {
    new->buffer_current = NULL;
  }

  *buffer = new;
  return 0;
}

#define INDENTED(fILE, x, y)                  \
  do {                                        \
    int indentation = x;                      \
    while (indentation--) fprintf(fILE, " "); \
    y;                                        \
  } while (0)

#define INDENT_BREAK 20

void buffer_dump(buffer_t *buffer, FILE *to) {
  FILE *file = to;
  uint32_t i;

  if (!buffer) return;

  if (!to) to = stdout;

  fprintf(file, "<Buffer>\n");
  INDENTED(file, 4, fprintf(file, "<Length>%u<Length>\n", buffer->size_bytes));
  INDENTED(file, 4, fprintf(file, "<Bytes>\n"));

  for (i = 0; i < buffer->size_bytes; i++) {
    if ((i % INDENT_BREAK) == 0) fprintf(file, "        ");

    fprintf(file, "0x%02x ", buffer->data[i]);

    if ((i % INDENT_BREAK) == (INDENT_BREAK - 1)) fprintf(file, "\n");
  }

  if ((i % INDENT_BREAK) != (INDENT_BREAK - 1)) fprintf(file, "\n");

  INDENTED(file, 4, fprintf(file, "</Bytes>\n"));
  fprintf(file, "</Buffer>\n");
}

int buffer_append_data(buffer_t *buffer, const uint8_t *data,
                       const uint32_t length) {
  if (!buffer) return -1;

  if (data && length > 0) {
    if (!buffer->data) {
      buffer->size_bytes = length;
      buffer->data = malloc(sizeof(uint8_t) * buffer->size_bytes);
      memcpy(buffer->data, data, buffer->size_bytes);
    } else {
      buffer->data = realloc(buffer->data,
                             sizeof(uint8_t) * (buffer->size_bytes + length));
      memcpy(&buffer->data[buffer->size_bytes], data, length);
      buffer->size_bytes += length;
    }

    buffer->buffer_current = &buffer->data[0];
  }

  return 0;
}

int buffer_has_enouch_data(buffer_t *buffer, uint32_t offset, uint32_t to_get) {
  int underflow;

  if (!buffer) return -1;

  underflow = (buffer->size_bytes >= ((offset + to_get) / 8)) ? 0 : -1;

  if (underflow && debug_buffers)
    g_warning("Detected Underflow offset %u, to_get %u, buffer size %u\n",
              offset, to_get, buffer->size_bytes);

  return underflow;
}

void *buffer_at_offset(buffer_t *buffer, uint32_t offset) {
  //     if (buffer_has_enouch_data(buffer, 0, offset) != 0) {
  //         return NULL;
  //     }
  return &buffer->data[offset / 8];
}
